If you figure it out then please share
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Every turkey is different man.. some like some calls and not others .. a box and slate should do just fine and as long as you are just yelping and not over calling you should be fine, mix in some clucks and purrs to the mix.. you could go back tomorrow and have 2 or 3 in your lap that wouldn't even look your way today.. if you find the right one in the right mood you can rub two rocks together and call him in..
They most likely had hens and wanted you to come to them.. remember in nature that is what happens most of the time.. my best advice is to get as close as you dare to their roost and don't call till the touch the ground, then do a fly down cackle and just a few yelps..
Good luck